DESIGN AND DEVELOPMENT OF ARDUINO-BASED STRAIN GAUGE TO MEASURE AND ANALYZE STRAIN DEVELOPMENT IN ASYMMETRIC INCREMENTAL FORMING

ABSTRACT: Asymmetric Incremental Sheet Forming (AISF) is a flexible, low-tooling-cost sheet forming process. The sheet is clamped around the periphery; a semi-circular headed forming tool follows a predetermined path generated using cam software according to the shape of the deformed part and tool performs a sequence of micro-deformations depending on step depth. Here, a method is used for the quantification of strain by using strain gauges, where obtained data is acquired, stored, visualized, and processed using an Arduino Uno board. Due to the reasonable cost and user-friendly operation, this strain gauge unit will be effectively applicable for the measurement of strain. The obtained signal is processed using a resistance bridge and then separated by an Analog-Digital Converter (ADC) external to the Arduino. Strain development in incremental forming is measured with a CMM machine and validated with this instrument. An L9 array was chosen for three levels of rotational speed of the spindle, forming tool diameter, feed motion of the tool, and step depth to determine optimal process parameters for the development of strain. The findings specify that the vertical step depth of the tool is the most influential parameter affecting strain development because localized deformation causes larger step depth and affects strain development.